* gimple-fold.h (get_range_strlen): Update prototype.
	* builtins.c (check_access): Update call to get_range_strlen to use
	c_strlen_data pointer.   Change various variable accesses to instead
	pull data from the c_strlen_data structure.
	(check_strncat_sizes, expand_builtin_strncat): Likewise.
	* calls.c (maybe_warn_nonstring_arg): Likewise.
	* tree-ssa-strlen.c (maybe_diag_stxncpy_trunc): Likewise.  Reset
	minimum length if maximum lengh is unknown.
	* gimple-ssa-sprintf.c (get_string_length): Likewise.  Drop code
	that used c_strlen, it's no longer needed.  Restructure slightly.
	(format_string): Set unlikely range appropriately.
	* gimple-fold.c (get_range_strlen): Update comments.  Fix minor
	formatting issues.
	(get_range_strlen):  Accept c_strlen_data pointer for external
	call sites as well.  Pass through to call to internal get_range_strlen.
	Adjust minlen, maxlen and maxbound as needed.
	(get_maxval_strlen): Update comments.
	(gimple_fold_builtin_strlen):  Update call to get_range_strlen
	to use c_strlen_data pointer.  Change variable accesses to instead
	use c_strlen_data data members.

	* gcc.dg/strlenopt-40.c: Disable a couple tests.
	* gcc.dg/strlenopt-48.c: Twiddle test.
	* gcc.dg/strlenopt-59.c: New test.
	* gcc.dg/tree-ssa/builtin-snprintf-5.c: New test.
	* g++.dg/init/strlen.C: New test.

Co-Authored-By: Jeff Law <law@redhat.com>

From-SVN: r267503